Porsche 928 (USA)
Manual transmission fluid capacity & service interval
Porsche 928 (USA) manual transmission fluid capacity is 4,5 liters. Service intervals include normal use. Data covers 2 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| 928 GTS (1991-1995) |
|
| 928 (1986-1992) |
|
Additional Notes
- The Porsche 928 (USA) manual transaxle holds 4.5 liters of fluid across both listed configurations, covering model years 1986-1995.
- A 4.5-liter capacity is relatively large for a manual transmission, which reflects the transaxle layout — a combined transmission and rear axle differential housed in a single unit at the rear of the vehicle.
- Both the 928 (1986-1992) and the 928 GTS (1991-1995) share an identical 4.5-liter service fill capacity, indicating no volumetric difference between the two configurations despite the GTS designation representing a higher-output variant.
- The capacity figure listed for both rows represents a service fill, meaning the amount of fluid used during a standard drain-and-refill service rather than a full overhaul where additional passages and cavities may retain or require fluid.
- Both configurations carry a normal use condition tied to the 4.5-liter capacity, meaning the specification applies under standard operating conditions rather than severe or high-stress duty cycles.